$219.00
Pay $194.00 after $25 OFF your total qualifying purchase upon opening a new card. 
Apply for a Home Depot Consumer Card- MAX Output Batteries Provide More Power and More Runtime
- Compatible with all RIDGID 18V Tools ad Chargers
- Free Parts and Service for Life with Registration
- View More Details
Free & Easy Returns In Store or Online
Return this item within 90 days of purchase. Read Return Policy
Product Details
RIDGID introduces the AC840040 18V MAX Output 4.0 Ah Lithium-Ion Battery (2-Pack). MAX Output batteries facilitate battery and tool communication unleashing the full potential of any RIDGID 18V Brushless Tool providing more power and more runtime. These batteries will provide up to 3X more runtime compared to the 1.5 Ah lithium-ion battery (AC870015). The Advanced Intelligent Electronics in MAX Output batteries enable users to power through the most demanding applications on the jobsite. The RIDGID MAX Output 4.0 Ah batteries are compact and lightweight, which reduces user fatigue. As always, these RIDGID MAX Output 4.0 Ah batteries are 100% compatible with all RIDGID 18V tools. Best of all, these batteries are eligible for the Industry's Only Lifetime Service Agreement, simply register within 90 days of purchase for FREE Parts, FREE Service, For LIFE. Charger sold separately.
- MAX Output Batteries provide up to 2X more power compared to the 1.5 Ah lithium-ion battery (AC870015)
- Up to 3X more runtime compared to the 1.5 Ah lithium-ion battery (AC870015)
- Advanced Intelligent Electronics and innovative cooling technology for extended battery life
- Compact size reduces user fatigue
- Fuel gauge displays power level on the job
- 100% Compatible: Works with all RIDGID 18V Batteries, Tools and Chargers
- Lifetime Service Agreement with registration within 90 days of purchase
- Includes: (2) R840040 18V 4.0 Ah MAX Output Lithium-Ion Battery and operator's manual
- Charger sold separately
- RIDGID: Build for a Lifetime
- Click Here to Shop All RIDGID Products
- Click here for more information on Electronic Recycling Programs
- Return Policy
- California residents
Specifications
Dimensions: H 4 in, W 3 in, L 5 in
Questions & Answers
50Questions
Q:Will a 2Ah Ridgid battery good on a Ridgid Sub Compact saw, just not the longer run time
by|Nov 16, 2023
1 Answer
Q:Why do you only compare this 4 ah battery to the 1.5 ah battery. Why not compare it to your other 4 ah battery? Compare apples to apples and organes to oranges instead of apples to oranges.
by|Oct 24, 2023
1 Answer
Q:What is the correct replacement battery for an older Rigid 18V Drill/Driver R84001?
by|May 30, 2023
1 Answer
Q:Why are the 2 max output 18v 6 amp hour batteries cheaper than the 4 amp hour batteries?
by|Apr 13, 2023
2 Answers
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Nov 1, 2023
Most useless warranty in the industry.
I purchased several Rigid cordless tools and batteries. Registered all according to instructions within a week of purchase. Less than a year later one battery failed. Goid luck if this happens to you. The warranty claims process is so convoluted and involved it is nearly impossible to navigate. Also the terms and condition nearly assure that no one will be able to meet the requirements. And Presto- your power tool is useless because you couldn’t get through the Rigid Customer Service Maze.
by
Response from RIDGIDNov 3, 2023
Hello, Mobman - We're sorry to hear that your battery stopped working and that you've had a frustrating experience with warranty support! We expect better and want to make this right! If you would, please be looking for an email from us at Reviews@RIDGIDmail.com.
Nov 7, 2021
Battery issues
So every tool, with the exception of the reciprocating saw, works great. The batteries do not fit the saw. I tried both and neither one fit. Found this out just as I needed the saw too. My suggestion is as soon as you get it, open it up in the car/truck and make sure the batteries fit all the tools.
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Aug 30, 2021
LIGHTWEIGHT; POWERFUL; LONG RUN-TIME
LIGHTWEIGHT; POWERFUL; LONG RUN-TIME — The RIDGID 18V Lithium-Ion MAX Output 4.0 Ah Battery (2-Pack) are a significant upgrade from my previous Ridgid battery. They are two times more powerful with three times the run time compared to the previous battery. I was impressed with how lightweight they are for batteries with this much power. When using one of these batteries with my Ridgid angle grinder, the increased power was apparent immediately. With the long runtime, there was not a problem completing the task. If there had been, having two charged batteries would have provided me with an incredible run time. The batteries took about 90 minutes to charge so when one battery runs out, the second battery could be used while the first one is being recharged. I am looking forward to the power and the long run time when using my new Ridgid framing nailer. The batteries are made in China.
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Jun 19, 2021
RIDGID 18V Lithium-Ion MAX Output 4.0 Ah Battery (2-Pack) – I recently got some Ridgid cordless t...
RIDGID 18V Lithium-Ion MAX Output 4.0 Ah Battery (2-Pack) – I recently got some Ridgid cordless tools and wanted some extra batteries. Of course, I had to buy Ridgid batteries for these tools, but that should be expected. From my experience the performance of Ridgid batteries is comparable to other tool brands. Their cases look and feel well made, they charge pretty quickly with a fast charger and they last about what I expect a 4.0 Ah battery to last in a drill or impact driver regardless of the brand. Ridgid batteries, like other brands include fuel gauges that indicate the power level.
The big selling point for Ridgid tools and batteries, after performance, is the Ridgid Lifetime Service Agreement.
by
Jun 17, 2021
This 2 pack set of 4.0 ah lithium ion Max output batteries are much more advanced than the older...
This 2 pack set of 4.0 ah lithium ion Max output batteries are much more advanced than the older line on batteries! Couldn't believe the difference until I tried them. They are compatable with all other 18 volt Ridgid tools and chargers. When I do jobs, either
around the house or away, I need batteries that will last! That's why 2 of these are perfect!
Highly recommend for DIY or professionals.
Check out the features:
These batteries are eligible for the Industry’s Only Lifetime Service Agreement, simply register within 90 days of purchase for FREE Parts, FREE Service, For LIFE.
MAX Output Batteries provide up to 2X more power compared to the 1.5 Ah lithium-ion battery (AC870015)
Up to 3X more runtime compared to the 1.5 Ah lithium-ion battery (AC870015)
Advanced electronics and innovative cooling technology for extended battery life
Compact size reduces user fatigue
Fuel gauge displays power level on the job
by
Jun 16, 2021
This batteries are an exact replacement for the batteries that came with my Rigid 18V tools. Whil...
This batteries are an exact replacement for the batteries that came with my Rigid 18V tools. Whilst cosmetically they are slightly different (please see my video for a description of these differences) they are functionally identical, This is a value pack, and comes with two batteries in a blister pack Four LED indicators read out the charge level when pressed, and display the charging status when they are in the charger.
I had some 1/4 inch concrete anchors to place in concrete and these extra batteries meant I could complete the whole job without needed to recharge a battery mid job.
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Jun 13, 2021
Great quality
This Rigid tool set puts the other sets I have bought over the years to shame. The quality and the feel of these tools is excellent; noticeably better than similar and even more expensive products on the market. The 4Ah and 2Ah batteries are a great idea and the tools feel balanced with both. Love the multi-tool; most sets don’t have this so a good bonus.
by
Jun 12, 2021
I got these batteries to power my ½” 18v impact wrench. I have several pieces of equipment that r...
I got these batteries to power my ½” 18v impact wrench. I have several pieces of equipment that require lots of power and torque to remove rusted nuts and bolts. These 4.0 Ah batteries have more power and last much longer than the 2.0 Ah batteries that came with my impact driver. I was changing two sets of 4 wheels / tires out on my trailer, it was very handy having two batteries to swap out, so didn’t have to stop for charging. They can be used with any other 18v tools for this brand, so I am looking to add more tools because of these batteries. Exceptional batteries
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Jun 12, 2021
These batteries are amazing. They fit all the various Ridgid power tools 18-volt types. Some that I previous purchased I have had between 5-10 years and still they charge and work great. These new Ridgid 18V Lithium-Ion Max 4-0 Ah batteries are just additional power for my growing Ridgid power tool collection. What is great addition that I am able to recharge these batteries easily from my solar power farm. My sheds are completely assembled by these rechargeable batteries. I am also using them for many projects and they last and last. Very fast recharging as well. I am very satisfied and looking forward to many more years of service from them. You can also register your purchase of this 2-pack and receive a Lifetime Service Agreement. That is how confident this company is about their batteries. Thank you, Ridgid, and Home Depot, for providing your customers the very best in quality. I love and recommend this 2-pack battery pack. I am sure you will love them too!
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Jun 11, 2021
I regularly use battery power tools by three well known quality tool companies. They all outperfo...
I regularly use battery power tools by three well known quality tool companies. They all outperform cheap or non-pro quality tools, the kind I had near my workbench and were useless since their batteries wore out in the second year and replacements cost more than the tool.
I only buy quality tools now, and if you're thinking about buying these you have decided that Ridgid has given itself an advantage over all the rest by promising free replacement of tool or battery forever. They charge quickly and quietly, are relatively small in size, offer a charge test light, and give the kind of rugged performance you need. The 4 AH is only a bit larger than the 2 AH and saves a lot of time and effort.
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